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AJvYcCXgNy6VxrGOFqDA3iKYWHIrBP52+S7u4GSvuOuRd95Ah6Acoau/S32QqKRTkERpiTnfUFPk5TfVXf/8YfhSfBdJfYH7xw/AbWYmHfPS X-Gm-Message-State: AOJu0YwUqNeGG5EnieU09gRzDWvjefmud7ZZxCY1/0dzn1VajLzI0gD6 sCEWmme8LBHwOR+p1TJS6AlqNYxkCG/KG4/p7J1Rxr3HjfKWzRdH8AVYRiwlKYI= X-Received: by 2002:a05:6512:e98:b0:513:59fb:1a50 with SMTP id bi24-20020a0565120e9800b0051359fb1a50mr2969946lfb.54.1709737743509; Wed, 06 Mar 2024 07:09:03 -0800 (PST) Received: from localhost ([102.222.70.76]) by smtp.gmail.com with ESMTPSA id s15-20020a05600c45cf00b0041304100fa9sm288447wmo.45.2024.03.06.07.09.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 06 Mar 2024 07:09:03 -0800 (PST) Date: Wed, 6 Mar 2024 18:08:59 +0300 From: Dan Carpenter To: Lukas Bulwahn , Andy Whitcroft Cc: Joe Perches , kernel-janitors , Linux Kernel Mailing List Subject: Re: checkpatch.pl getting stuck on a macro in mm/kmsan/kmsan_test.c Message-ID: <2bac2cd3-ccdc-413f-aae7-110b5c36122a@moroto.mountain> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Wed, Mar 06, 2024 at 10:33:55AM +0100, Lukas Bulwahn wrote: > Dear Joe, > > while running checkpatch.pl -f on all files in the kernel repository > (v6.8-rc1) for some experiment, I noticed that checkpatch.pl got stuck > on mm/kmsan/kmsan_test.c, i.e., ./scripts/checkpatch.pl -f > mm/kmsan/kmsan_test.c never terminates. > > I could already boil it down to checkpatch getting stuck on the macro > #define DEFINE_TEST_MEMSETXX(size), see lines 541 to 554 in > mm/kmsan/kmsan_test.c on v6.8-rc1. > > I do not know if it is worth fixing, but certainly I was surprised > that reasonable code can put checkpatch into some stuck state. I think the bug is ancient... Here is a stupid solution. But afterward it still prints a ton of Perl warnings: substr outside of string at ./scripts/checkpatch.pl line 5158. Use of uninitialized value $op_type in string ne at ./scripts/checkpatch.pl line 5164. substr outside of string at ./scripts/checkpatch.pl line 5158. Use of uninitialized value $op_type in string ne at ./scripts/checkpatch.pl line 5164. regards, dan carpenter diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index 9c4c4a61bc83..bd7a286bc1ce 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -2260,10 +2260,14 @@ sub annotate_values { } elsif ($cur =~ /(^.)/o) { print "C($1)\n" if ($dbg_values > 1); } + my $old = $cur; if (defined $1) { $cur = substr($cur, length($1)); $res .= $type x length($1); } + if ($old eq $cur) { + last; + } } return ($res, $var);